Coal seam gas extraction equipment and extraction method

Abstract

The present invention belongs to the technical field of extraction equipment, specifically a coal seam gas extraction equipment and extraction method, including a fixed cylinder, a matching cylindrical sealing gasket is fixed on the inner ring surface of the fixed cylinder, a fixed ring is fixed on the upper surface of the fixed cylinder, an external threaded tube is threadedly inserted in the middle of the fixed ring along the vertical direction, a first rotating tube is fixed on the lower end surface of the external threaded tube, a drill bit is installed on the lower end surface of the first rotating tube, and a matching filter is installed in the through hole on the drill bit. When the extraction equipment is used to extract gas at different depths in the coal seam, there is no need to remove the drill bit in the extraction equipment, and gas leakage can be avoided when extracting gas in the coal seam, which is conducive to safe gas extraction in the coal seam.

Description

Technical Field

[0001] The present invention relates to the technical field of extraction equipment, and in particular to coal seam gas extraction equipment and an extraction method. Background Art

[0002] Coalbed methane, also known as coalbed gas, refers to a mixture of methane, carbon dioxide and nitrogen that escapes from coal and surrounding rocks. Gas is a harmful factor in coal mine production. It not only pollutes the air, but also when the gas content in the air is too high, it can cause explosions when exposed to open flames, resulting in safety accidents.

[0003] In order to ensure safe construction of coal seams, coal seam gas needs to be extracted. Coal seam gas extraction is to drill into the coal seam and gas concentration area, connect the borehole to a dedicated pipeline, and use extraction equipment to extract the gas in the coal seam and goaf to the ground. The extracted gas is then utilized or discharged into the total return air flow.

[0004] However, when using existing extraction equipment, since it is necessary to extract gas at different depths in the coal seam, it is necessary to drill a hole first, then remove the drilling equipment, and extract the gas in the hole drilled in the coal seam, which is prone to gas leakage and is not conducive to safe gas extraction in the coal seam.

[0005] To this end, we propose a coal seam gas extraction equipment and extraction method. Summary of the Invention

[0006] In view of the above-mentioned problems and / or the problems existing in the existing coal seam gas extraction equipment and extraction method, the present invention is proposed.

[0007] Therefore, the purpose of the present invention is to provide a coal seam gas extraction equipment and extraction method. By improving the existing extraction equipment, it can solve the problem that when the existing extraction equipment is used, it is necessary to extract gas at different depths in the coal seam, and it is necessary to drill a hole first, then remove the drilling equipment, and extract the gas in the hole drilled in the coal seam, which is easy to cause gas leakage and is not conducive to safe gas extraction in the coal seam.

[0008] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0009] A coal seam gas extraction equipment includes a fixed cylinder, an inner ring surface of the fixed cylinder is fixed with a matching cylindrical sealing gasket, an upper surface of the fixed cylinder is fixed with a fixing ring, the middle part of the fixing ring is threadedly inserted with an external threaded tube along the vertical direction, a first rotating tube is fixed to the lower end surface of the external threaded tube, the inner side of the external threaded tube is connected to the inner side of the first rotating tube, the outer ring surface of the first rotating tube is matched with the inner ring surface of the cylindrical sealing gasket, a drill bit is installed on the lower end surface of the first rotating tube, a through hole is opened in the middle of the drill bit, the through hole passes through the upper and lower sides of the middle part of the drill bit, the through hole on the drill bit is connected to the inner side of the first rotating tube, and a matching filter is installed in the through hole on the drill bit.

[0010] As a preferred solution of a coal seam gas extraction equipment described in the present invention, wherein: the externally threaded tube is in a vertical state, a second rotating tube is fixed to the upper end surface of the externally threaded tube, the inner side of the second rotating tube is connected to the inner side of the externally threaded tube, a first connecting ring is rotatably installed on the outer side of the lower end of the outer ring surface of the second rotating tube through a bearing, and a limiting rod is fixed in the middle of the four sides of the lower surface of the first connecting ring, and the lower ends of the limiting rods are slid in the vertical direction and inserted into the corresponding positions on the fixing ring and the fixing cylinder, and the two sides of the upper surface of the first connecting ring are A fixing rod is fixed in the middle, and the fixing rods are in a vertical state. A second connecting ring is fixed between the upper end surfaces of the fixing rods. A first connecting pipe in a vertical state is installed in the middle of the second connecting ring. The second connecting ring can limit the first connecting pipe. The lower end of the first connecting pipe is rotatably connected to the upper end of the second rotating pipe. A connected air pump is installed on the upper end of the first connecting pipe. The air outlet interface of the air pump faces upward and is installed with a connected second connecting pipe. The upper end of the second connecting pipe is installed between external equipment for storing gas.

[0011] As a preferred solution of the coal seam gas extraction equipment described in the present invention, wherein: a limiting ring is fixed on the lower end surface of the first connecting tube, a retaining groove corresponding to the limiting ring is opened on the upper surface of the second rotating tube, the limiting ring is rotatably connected with the retaining groove on the second rotating tube through a bearing, and the retaining groove on the second rotating tube helps to limit the limiting ring.

[0012] As a preferred solution of the coal seam gas extraction equipment described in the present invention, a first pulley is installed on the outer side of the upper end of the outer ring surface of the second rotating tube, a connecting plate is fixed on one side of the outer ring surface of the first connecting ring, and a rotating motor is installed on the upper surface of the connecting plate. The connecting plate can support and limit the rotating motor, thereby facilitating the stable use of the rotating motor.

[0013] As a preferred solution of the coal seam gas extraction equipment described in the present invention, the output shaft of the rotating motor faces upward, and a second pulley is installed at the upper end of the outer ring surface of the rotating motor output shaft corresponding to the first pulley, and a matching transmission belt is installed between the first pulley and the second pulley, and the transmission belt helps to transmit power between the first pulley and the second pulley.

[0014] As a preferred solution of the coal seam gas extraction equipment described in the present invention, the limiting rods are all in a vertical state, and matching second limiting holes are opened on the corresponding limiting rods on the fixed ring. The second limiting holes all pass through the upper surface and the lower surface of the corresponding positions on the fixed ring, and the lower ends of the limiting rods all pass through the corresponding second limiting holes on the fixed ring. The second limiting holes on the fixed ring help to limit the limiting rods.

[0015] As a preferred solution of the coal seam gas extraction equipment described in the present invention, wherein: the middle part of the cylinder around the fixed cylinder is provided with a matching first limiting hole corresponding to the limiting rod, the first limiting holes pass through the upper surface and the lower surface of the corresponding position on the fixed cylinder, and the lower end of the limiting rod is inserted into the corresponding first limiting hole on the fixed cylinder. The first limiting hole on the fixed cylinder helps to limit the limiting rod.

[0016] As a preferred solution of the coal seam gas extraction equipment described in the present invention, a mounting ring is fixed to the outer side of the lower end of the outer ring surface of the fixed cylinder, and mounting plates are fixed to the middle part of the outer ring surface of the mounting ring. Bolts are threadedly inserted in the middle part of the mounting plates along the vertical direction, and the bolts facilitate the installation and positioning of the mounting plates.

[0017] As a preferred solution of the coal seam gas extraction equipment described in the present invention, the bolts are all in a vertical state and pass through the upper and lower surfaces of the middle part of the corresponding mounting plate, a deformable sealing ring is fixed on the lower surface of the mounting ring, and the lower surface of the mounting ring and the upper surface of the deformable sealing ring are in a matching and fitting state, and the mounting ring can fix and limit the deformable sealing ring.

[0018] The present invention provides a method for extracting coal seam gas using a coal seam gas extraction device, the method comprising the following steps:

[0019] Step 1: Align the lower surface of the deformable sealing ring with the surface of the location where coal seam gas extraction is required, and further rotate the bolt so that the lower end of the bolt is inserted into the location where coal seam gas extraction is required;

[0020] Step 2: After the bolt is inserted into the position where coal seam gas extraction is required, the mounting ring will squeeze the deformable sealing ring, causing the lower surface of the deformable sealing ring to be squeezed and deformed, so as to ensure that the lower surface of the deformable sealing ring is in a matching and fitting state with the position where coal seam gas extraction is required, so as to seal the fixed cylinder and the position where coal seam gas extraction is required;

[0021] Step 3: Further turn on the rotating motor. When the rotating motor is turned on, the output shaft of the rotating motor can drive the second rotating tube to rotate through the second pulley, the transmission belt and the first pulley. When the second rotating tube rotates, it drives the externally threaded tube to rotate, so that the externally threaded tube moves downward along the first connecting ring with which it is threadedly connected. When the externally threaded tube rotates and moves, it can drive the drill bit to move downward and rotate through the first rotating tube.

[0022] Step 4: When the drill bit moves downward and rotates, it will drill into the position where coal seam gas extraction is required, and the air pump is further turned on. When the air pump is turned on, the air pump can extract gas from the outside world at the position where coal seam gas extraction is required through the first connecting pipe, the second rotating pipe, the external threaded pipe, the first rotating pipe and the filter in the through hole on the drill bit.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. In the present invention, when the external threaded tube rotates and moves downward, the drill bit can be driven to rotate and move downward through the first rotating tube, which is helpful to extract gas at different depths in the coal seam respectively when in use. When the gas at different depths in the coal seam is extracted by the extraction equipment, there is no need to remove the drill bit in the extraction equipment. When extracting gas in the coal seam, gas leakage can be avoided, which helps to safely extract gas from the coal seam.

[0025] 2. In the present invention, the air pump can extract gas from the corresponding position in the external coal seam through the connected first connecting pipe, the second rotating pipe, the external threaded pipe, the first rotating pipe and the filter in the through hole on the drill bit. The air pump can discharge the extracted gas through the second connecting pipe to the external equipment for collecting gas. When the extracted gas passes through the filter in the through hole in the drill bit, the filter can filter impurities or dust carried in the gas.

[0026] 3. In the present invention, the output shaft of the rotating motor can drive the second rotating tube to rotate through the second pulley, the transmission belt and the first pulley. When the second rotating tube rotates, it can drive the external threaded tube to rotate. When the external threaded tube rotates, it will move in the vertical direction along the position where it is threadedly connected on the fixed ring. The first rotating tube and the fixed tube can be sealed by the cylindrical sealing gasket, and the installation ring and the position where coal seam gas extraction is required can be sealed by the deformable sealing ring, thereby preventing gas leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the deformable sealing ring of the present invention;

[0029] Figure 3 Schematic diagram of the limiting rod structure of the present invention;

[0030] Figure 4 for Figure 3 A partial enlarged schematic diagram of part A in the middle;

[0031] Figure 5 for Figure 3 A partial enlarged schematic diagram of part B in the middle;

[0032] Figure 6 for Figure 3 A partial enlarged schematic diagram of the middle C part;

[0033] Figure 7 for Figure 3 A partial enlarged schematic diagram of the middle D part;

[0034] Figure 8 It is a schematic diagram of the fixed cylinder structure of the present invention.

[0035] In the figure: 1. Mounting ring; 2. Mounting plate; 3. Bolt; 4. Deformable sealing ring; 5. Fixed cylinder; 6. Cylindrical sealing gasket; 7. Fixed ring; 8. First rotating tube; 9. Second rotating tube; 10. Drill bit; 11. Through hole; 12. Filter; 13. Externally threaded tube; 14. First connecting ring; 15. Second connecting ring; 16. Limit rod; 17. First limiting hole; 18. Second limiting hole; 19. Connecting plate; 20. Rotating motor; 21. First pulley; 22. Second pulley; 23. Transmission belt; 24. Limiting ring; 25. Retention groove; 26. Fixed rod; 27. First connecting tube; 28. Second connecting tube; 29. ​​Air pump. DETAILED DESCRIPTION

[0036] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0037] The present invention provides a coal seam gas extraction device and extraction method, which are helpful for extracting gas at different depths in a coal seam. When using the extraction device to extract gas at different depths in a coal seam, there is no need to remove the drill bit in the extraction device. When extracting gas from the coal seam, gas leakage can be avoided, which helps to safely extract gas from the coal seam.

[0038] See also Figure 1-8 A coal seam gas extraction device includes a fixed tube 5, a cylindrical sealing gasket 6 that matches and fits the inner ring surface of the fixed tube 5, a fixed ring 7 that is fixed to the upper surface of the fixed tube 5, an external threaded tube 13 that is threadedly inserted in the middle of the fixed ring 7 along the vertical direction, a first rotating tube 8 that is fixed to the lower end surface of the external threaded tube 13, the inner side of the external threaded tube 13 is connected to the inner side of the first rotating tube 8, the outer ring surface of the first rotating tube 8 is in a matching and fitting state with the inner ring surface of the cylindrical sealing gasket 6, a drill bit 10 is installed on the lower end surface of the first rotating tube 8, a through hole 11 is opened in the middle of the drill bit 10, and the through hole 11 passes through the middle of the drill bit 10 The upper and lower sides of the drill bit 10 are connected to the inner side of the first rotating tube 8, and a matching filter 12 is installed in the through hole 11 on the drill bit 10. When the external threaded tube 13 rotates and moves downward, the drill bit 10 can be driven to rotate and move downward through the first rotating tube 8, which helps to extract gas at different depths in the coal seam when used. When the extraction equipment is used to extract gas at different depths in the coal seam, there is no need to remove the drill bit 10 in the extraction equipment. When extracting gas in the coal seam, gas leakage can be avoided, which helps to safely extract gas from the coal seam.

[0039] Among them, the external threaded tube 13 is in a vertical state, and the second rotating tube 9 is fixed to the upper end surface of the external threaded tube 13. The inner side of the second rotating tube 9 is connected to the inner side of the external threaded tube 13. The outer side of the lower end of the outer ring surface of the second rotating tube 9 is rotatably installed with a first connecting ring 14 through a bearing. The middle part of the lower surface of the first connecting ring 14 is fixed with a limiting rod 16, and the lower end of the limiting rod 16 is slid in the vertical direction and inserted into the corresponding position on the fixing ring 7 and the fixing cylinder 5. The middle part of the two sides of the upper surface of the first connecting ring 14 is fixed with a fixing rod 26, and the fixing rods 26 are in a vertical state. The second connecting ring 15 is fixed between the upper end surfaces of the fixing rods 26. The middle part of the second connecting ring 15 is installed with the first connecting ring in a vertical state. Taking over the pipe 27, the second connecting ring 15 can limit the first connecting pipe 27. The lower end of the first connecting pipe 27 is rotatably connected to the upper end of the second rotating pipe 9. The upper end of the first connecting pipe 27 is installed with a connected air pump 29. The air outlet interface of the air pump 29 faces upward and is installed with a connected second connecting pipe 28. The upper end of the second connecting pipe 28 is installed with an external device for storing gas; a limiting ring 24 is fixed on the lower end surface of the first connecting pipe 27, and a retaining groove 25 is provided on the upper surface of the second rotating tube 9 corresponding to the limiting ring 24. The limiting ring 24 is rotatably connected to the retaining groove 25 on the second rotating tube 9 through a bearing. The retaining groove 25 on the second rotating tube 9 helps to limit the limiting ring 24.

[0040] A first pulley 21 is installed on the outer side of the upper end of the outer ring surface of the second rotating tube 9, and a connecting plate 19 is fixed to one side of the outer ring surface of the first connecting ring 14. A rotating motor 20 is installed on the upper surface of the connecting plate 19. The connecting plate 19 can support and limit the rotating motor 20, so as to facilitate the stable use of the rotating motor 20; the output shaft of the rotating motor 20 faces upward, and a second pulley 22 is installed on the upper end of the outer ring surface of the output shaft of the rotating motor 20 corresponding to the first pulley 21, and a matching transmission belt 23 is jointly installed between the first pulley 21 and the second pulley 22, and the transmission belt 23 helps to transmit power between the first pulley 21 and the second pulley 22.

[0041] The limiting rods 16 are all in a vertical state, and matching second limiting holes 18 are opened on the fixing ring 7 corresponding to the limiting rods 16. The second limiting holes 18 all pass through the upper surface and the lower surface of the corresponding position on the fixing ring 7, and the lower ends of the limiting rods 16 all pass through the corresponding second limiting holes 18 on the fixing ring 7. The second limiting holes 18 on the fixing ring 7 help to limit the limiting rods 16; matching first limiting holes 17 are opened in the middle part of the cylinder body around the fixing cylinder 5 corresponding to the limiting rods 16. The first limiting holes 17 all pass through the upper surface and the lower surface of the corresponding position on the fixing cylinder 5, and the lower ends of the limiting rods 16 are inserted into the corresponding first limiting holes 17 on the fixing cylinder 5. The first limiting holes 17 on the fixing cylinder 5 help to limit the limiting rods 16.

[0042] A mounting ring 1 is fixed to the outer side of the lower end of the outer ring surface of the fixing cylinder 5, and a mounting plate 2 is fixed to the middle part of the outer ring surface of the mounting ring 1. Bolts 3 are threadedly inserted in the middle part of the mounting plate 2 along the vertical direction. The bolts 3 facilitate the installation and positioning of the mounting plate 2; the bolts 3 are all in a vertical state and pass through the upper and lower surfaces of the middle part of the corresponding mounting plate 2. A deformable sealing ring 4 is fixed to the lower surface of the mounting ring 1. The lower surface of the mounting ring 1 and the upper surface of the deformable sealing ring 4 are in a matching and fitting state, and the mounting ring 1 can fix and limit the deformable sealing ring 4.

[0043] The present invention provides a method for extracting coal seam gas using a coal seam gas extraction device, the method comprising the following steps:

[0044] Step 1: Align the lower surface of the deformable sealing ring 4 with the surface of the location where coal seam gas extraction is required, and further rotate the bolt 3 so that the lower end of the bolt 3 is inserted into the location where coal seam gas extraction is required;

[0045] Step 2: After the bolt 3 is inserted into the position where coal seam gas extraction is required, the mounting ring 1 will squeeze the deformable sealing ring 4, causing the lower surface of the deformable sealing ring 4 to be squeezed and deformed, so as to ensure that the lower surface of the deformable sealing ring 4 is in a matching and fitting state with the position where coal seam gas extraction is required, so as to seal the fixing tube 5 with the position where coal seam gas extraction is required;

[0046] Step 3: Further turn on the rotary motor 20. When the rotary motor 20 is turned on, the output shaft of the rotary motor 20 can drive the second rotary tube 9 to rotate through the second pulley 22, the transmission belt 23 and the first pulley 21. When the second rotary tube 9 rotates, it drives the externally threaded tube 13 to rotate, so that the externally threaded tube 13 moves downward along the first connecting ring 14 with which it is threadedly connected. When the externally threaded tube 13 rotates and moves, it can drive the drill bit 10 to move downward and rotate through the first rotary tube 8.

[0047] Step 4: When the drill bit 10 moves downward and rotates, it will drill into the position where coal seam gas extraction is required, and the air pump 29 is further turned on. When the air pump 29 is turned on, the air pump 29 can extract gas from the outside world where coal seam gas extraction is required through the first connecting tube 27, the second rotating tube 9, the external threaded tube 13, the first rotating tube 8 and the filter 12 in the through hole 11 on the drill bit 10.

[0048] The working principle of the present invention: During use, the lower surface of the deformable sealing ring 4 is aligned with the surface of the position where coal seam gas extraction is required, and the mounting ring 1 and the mounting plate 2 are further pressed downward, so that the mounting ring 1 squeezes the deformable sealing ring 4 downward. When the mounting ring 1 squeezes the deformable sealing ring 4 downward, the lower surface of the deformable sealing ring 4 and the position where coal seam gas extraction is required will be in a matching, fitting and sealed state. The mounting plate 2 and the position where coal seam gas extraction is required are further installed and limited by the bolts 3. The bolts 3 can fix and limit the mounting ring 1 through the mounting plate 2, which is convenient for the stable use of the mounting ring 1. The mounting ring 1 can fix and limit the fixed tube 5 and the various components assembled on the fixed tube 5, which is helpful for the stable use of the fixed tube 5 and the various components assembled on the fixed tube 5.

[0049] The rotating motor 20 on the upper surface of the connecting plate 19 is opened, and the connecting plate 19 can fix and limit the rotating motor 20, so as to facilitate the stable use of the rotating motor 20. When the rotating motor 20 is opened, the output shaft of the rotating motor 20 can drive the second pulley 22 to rotate. When the second pulley 22 rotates, the first pulley 21 can be driven to rotate through the transmission belt 23. When the first pulley 21 rotates, the second rotating tube 9 can be driven to rotate. When the second rotating tube 9 rotates, it will rotate along the limiting ring 24 on the lower surface of the first connecting tube 27 through the retaining groove 25. The first connecting tube 27 and the second rotating tube 9 can be limited by the limiting ring 24 and the retaining groove 25. When the second rotating tube 9 rotates, it will rotate along the corresponding position on the first connecting ring 14. When the second rotating tube 9 rotates, it can drive the external threaded tube 13 to rotate.

[0050] When the external threaded tube 13 rotates, it will move downward along the position where it is threadedly connected on the fixing ring 7. When the external threaded tube 13 moves downward, it will drive the first connecting ring 14 to move downward through the second rotating tube 9. When the first connecting ring 14 moves downward, it can drive the limiting rod 16 to move downward along the second limiting hole 18 on the fixing ring 7 and the first limiting hole 17 on the fixing tube 5. The second limiting hole 18 on the fixing ring 7 and the first limiting hole 17 on the fixing tube 5 can limit the first connecting ring 14 through the limiting rod 16, which helps to stably move the first connecting ring 14 in the vertical direction. When the external threaded tube 13 rotates and moves downward, it can drive the first rotating tube 8 to rotate and move downward along the inner side of the cylindrical sealing gasket 6. When the first rotating tube 8 rotates and moves downward, it can drive the drill bit 10 to rotate and move downward.

[0051] When the drill bit 10 rotates and moves downward, it will drill into the corresponding position on the coal seam. The cylindrical sealing gasket 6 can seal the first rotating tube 8 and the fixed tube 5, and the deformable sealing ring 4 can seal the installation ring 1 and the position where coal seam gas extraction is required, thereby preventing gas leakage. After the drill bit 10 is drilled to the corresponding height in the coal seam, the upper end of the second connecting tube 28 is installed between the external equipment for collecting gas, and the air pump 29 is further opened. When the air pump 29 is turned on, the air pump 29 can extract gas from the corresponding position in the external coal seam through the connected first connecting tube 27, the second rotating tube 9, the external threaded tube 13, the first rotating tube 8 and the filter 12 in the through hole 11 on the drill bit 10.

[0052] The air pump 29 can discharge the extracted gas through the second connecting pipe 28 to the external equipment for collecting gas, so as to extract and collect the gas. When the extracted gas passes through the filter 12 in the through hole 11 on the drill bit 10, the filter 12 can filter the impurities or dust carried in the gas to facilitate the extraction of the gas. By moving the drill bit 10 to different heights in the vertical direction, the gas at different depths in the coal seam can be extracted and collected. When extracting the gas in the coal seam, there is no need to remove the drill bit 10. When the drill bit 10 is drilled into the depth of the corresponding position in the coal seam, the gas in the corresponding depth in the coal seam is extracted at the same time, which can avoid leakage of gas in the coal seam.

[0053] During use, it helps to extract gas at different depths in the coal seam respectively. When extracting gas at different depths in the coal seam through this extraction equipment, there is no need to remove the drill bit 10 in the extraction equipment. When extracting gas in the coal seam, gas leakage can be avoided, which helps to safely extract gas from the coal seam, making it easier to use this extraction equipment.

[0054] Although the present invention has been described above with reference to embodiments, various modifications may be made thereto and equivalent components may be substituted without departing from the scope of the present invention. In particular, as long as there are no structural conflicts, the various features of the embodiments disclosed herein may be combined with each other in any manner, and the omission of an exhaustive description of such combinations in this specification is solely for the sake of space and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A coal seam gas extraction device, comprising a fixed cylinder (5), characterized in that: A matching cylindrical sealing gasket (6) is fixed on the inner annular surface of the fixed cylinder (5), a fixing ring (7) is fixed on the upper surface of the fixed cylinder (5), an external threaded tube (13) is inserted into the middle of the fixing ring (7) along the vertical direction, and a first rotating tube (8) is fixed on the lower end surface of the external threaded tube (13), the inner side of the external threaded tube (13) is in communication with the inner side of the first rotating tube (8), and the outer annular surface of the first rotating tube (8) is in contact with the cylindrical sealing gasket. The inner annular surfaces of the gasket (6) are in a matching and fitting state. A drill bit (10) is installed on the lower end surface of the first rotating tube (8). A through hole (11) is opened in the middle of the drill bit (10). The through hole (11) passes through the upper side and the lower side of the middle of the drill bit (10). The inside of the through hole (11) on the drill bit (10) is in a connected state with the inner side of the first rotating tube (8). A matching filter (12) is installed in the through hole (11) on the drill bit (10). The externally threaded tube (13) is in a vertical state, and a second rotating tube (9) is fixed to the upper end surface of the externally threaded tube (13). The inner side of the second rotating tube (9) is in a state of communication with the inner side of the externally threaded tube (13). A first connecting ring (14) is rotatably mounted on the outer side of the lower end of the outer ring surface of the second rotating tube (9) through a bearing. A limiting rod (16) is fixed to the middle of the four sides of the lower surface of the first connecting ring (14). The lower ends of the limiting rods (16) are slid in the vertical direction and inserted into the corresponding positions on the fixing ring (7) and the fixing cylinder (5). The middle of both sides of the upper surface of the first connecting ring (14) are fixed with a fixing rod (16). The fixed rod (26) and the fixed rod (26) are both in a vertical state. A second connecting ring (15) is fixed between the upper end surfaces of the fixed rod (26). A first connecting pipe (27) in a vertical state is installed in the middle of the second connecting ring (15). The lower end of the first connecting pipe (27) is rotatably connected to the upper end of the second rotating pipe (9). The upper end of the first connecting pipe (27) is installed with a connected air pump (29). The air outlet interface of the air pump (29) faces upward and is installed with a connected second connecting pipe (28). The upper end of the second connecting pipe (28) is installed between an external device for storing gas.

2. The coal seam gas extraction equipment according to claim 1, characterized in that: A limiting ring (24) is fixed on the lower end surface of the first connecting tube (27), and a retaining groove (25) is provided on the upper surface of the second rotating tube (9) corresponding to the limiting ring (24). The limiting ring (24) is rotatably connected to the retaining groove (25) on the second rotating tube (9) via a bearing.

3. The coal seam gas extraction equipment according to claim 2, characterized in that: A first pulley (21) is installed on the outer side of the upper end of the outer ring surface of the second rotating tube (9), a connecting plate (19) is fixed on one side of the outer ring surface of the first connecting ring (14), and a rotating motor (20) is installed on the upper surface of the connecting plate (19).

4. The coal seam gas extraction equipment according to claim 3, characterized in that: The output shaft of the rotating motor (20) faces upward, and a second pulley (22) is installed on the upper end of the outer ring surface of the output shaft of the rotating motor (20) corresponding to the first pulley (21), and a matching transmission belt (23) is installed between the first pulley (21) and the second pulley (22).

5. The coal seam gas extraction equipment according to claim 4, characterized in that: The limiting rods (16) are all in a vertical state, and a matching second limiting hole (18) is opened on the fixing ring (7) corresponding to the limiting rod (16). The second limiting holes (18) all pass through the upper surface and the lower surface of the corresponding position on the fixing ring (7), and the lower end of the limiting rod (16) passes through the corresponding second limiting hole (18) on the fixing ring (7).

6. The coal seam gas extraction equipment according to claim 5, characterized in that: The middle part of the cylinder body around the fixed cylinder (5) is provided with a first limiting hole (17) that matches the limiting rod (16). The first limiting holes (17) pass through the upper surface and the lower surface of the corresponding position on the fixed cylinder (5). The lower end of the limiting rod (16) is inserted into the corresponding first limiting hole (17) on the fixed cylinder (5).

7. The coal seam gas extraction equipment according to claim 6, characterized in that: A mounting ring (1) is fixed to the outer side of the lower end of the outer ring surface of the fixing cylinder (5), mounting plates (2) are fixed to the middle of the outer ring surface of the mounting ring (1), and bolts (3) are threadedly inserted in the middle of the mounting plates (2) along the vertical direction.

8. The coal seam gas extraction equipment according to claim 7, characterized in that: The bolts (3) are all in a vertical state and penetrate the upper surface and the lower surface of the middle part of the corresponding mounting plate (2); a deformable sealing ring (4) is fixed to the lower surface of the mounting ring (1); and the lower surface of the mounting ring (1) and the upper surface of the deformable sealing ring (4) are in a matching and fitting state.

9. A coal seam gas extraction method according to claim 8, characterized in that: The extraction method includes the following steps: Step 1: Align the lower surface of the deformable sealing ring (4) with the surface of the location where coal seam gas extraction is required, and further rotate the bolt (3) so that the lower end of the bolt (3) is inserted into the location where coal seam gas extraction is required; Step 2: After the bolt (3) is inserted into the position where coal seam gas extraction is required, the mounting ring (1) will squeeze the deformable sealing ring (4), causing the lower surface of the deformable sealing ring (4) to be squeezed and deformed, so as to ensure that the lower surface of the deformable sealing ring (4) and the position where coal seam gas extraction is required are in a matching and fitting state, so as to facilitate sealing between the fixing cylinder (5) and the position where coal seam gas extraction is required; Step 3: further turning on the rotating motor (20). When the rotating motor (20) is turned on, the output shaft of the rotating motor (20) can drive the second rotating tube (9) to rotate through the second pulley (22), the transmission belt (23) and the first pulley (21). When the second rotating tube (9) rotates, it drives the externally threaded tube (13) to rotate, so that the externally threaded tube (13) moves downward along the first connecting ring (14) that is threadedly connected to it. When the externally threaded tube (13) rotates and moves, it can drive the drill bit (10) to move downward and rotate through the first rotating tube (8); Step 4: When the drill bit (10) moves downward and rotates, it drills into the position where coal seam gas extraction is required, and further turns on the air pump (29). When the air pump (29) is turned on, the air pump (29) can extract gas from the outside world at the position where coal seam gas extraction is required through the first connecting pipe (27), the second rotating pipe (9), the external threaded pipe (13), the first rotating pipe (8) and the filter (12) in the through hole (11) on the drill bit (10).

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